The gimlet bit is a very aged style. The little bit is identical design as that Utilized in the gimlet, a self-contained tool for dull tiny holes in Wooden by hand. Because about 1850, gimlets have had several different cutter patterns, but some are still made with the original Variation. https://drillbit37048.theobloggers.com/40566686/not-known-factual-statements-about-drill-bit-manufacturer